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• Grayed-Out Sleep and Hibernate Options on Windows 7 After Updating Graphics Driver

  - by Maxim Zaslavsky

  I have a Gateway M275 Tablet PC, on which I've installed Windows 7 Ultimate. The laptop is quite old, so there aren't any Win7 drivers for it, not to mention any Vista drivers. Win7 has been working for some time, but I noticed that my video output wasn't working. I went into Device Manager and found that I didn't have a driver for my video card: it just recognized it as the standard one. I searched online and found an XP driver for it, released by Gateway. Device Manager accepted this driver and prompted me to reboot. After that, I noticed that my Sleep and Hibernate options in the Shut Down menu have been grayed-out. I looked online and found that many people are attributing this to display drivers, as such an old driver would surely not be compatible with the standby procedures Windows 7 uses. To make it clear: I was able to Sleep and Hibernate before updating the drivers; now, I can't. Running powercfg /a gives me, "An internal system component has disabled this standby state," for each available standby mode. Is there some way that the driver can be modified to support hibernation? The new driver fixed my video output problem, but I guess hibernation is more important for me. If not, what steps should I take to remove the driver and just leave the standard Windows one, which previously supported hibernation and sleep on this computer? Thanks in advance.

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• Windows 7 SSH file server

  - by Siriss

  Hello all- I have looked at the other posts, but have not quite found an answer I have a question about windows file sharing over SSH. I have copssh installed and it is working for Remote desktop connections. I have port 22 forwarded on my router etc. I connect from a Mac or Putty with this address: ssh -l copsshusername 3391:localhost:3389 [external ip] That works fine. I would like to configure Windows 7 to allow my ssh account that I use to login, access to certain shared folders. I have documents and videos and things that I would like to be able to download externally. I have done this before on Linux and a long time ago on XP, but I cannot figure out what I am missing on Windows 7. There is a designated SSH user that copssh uses to run the service and that I use to to login as. I have googled and googled and have not found a solution that does everything I need that is why I am turning here for ideas. I hope I am explaining this correctly. Thank you very much for your help!

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• Windows Explorer Keeps On Crashing

  - by Josefvz

  Hey Folks. I'm lost... I'm using Windows 7 Ultimate 64bit. My Pc is up to date(windows updates) and I've used Winutilities to scan my registry. My explorer.exe keeps on crashing. Just randomly it seems. I don't even need to be doing anything particular. I do have experience with pc in general as I'm a software developer. I know you will require additional info, but i don't know what, so just leave a comment and I'll update. Additional info I think i should also mention that explorer is the only app that crashes on my pc. The crash report i got now: Description: A problem caused this program to stop interacting with Windows. Problem signature: Problem Event Name: AppHangB1 Application Name: explorer.exe Application Version: 6.1.7600.16450 Application Timestamp: 4aebab8d Hang Signature: 0a1b Hang Type: 16897 OS Version: 6.1.7600.2.0.0.256.1 Locale ID: 7177 Additional Hang Signature 1: 0a1bdae38ae7300761c516c4416d992c Additional Hang Signature 2: 1c51 Additional Hang Signature 3: 1c518a49cc7d37652d26c521e96f66c2 Additional Hang Signature 4: 521e Additional Hang Signature 5: 521e607ec26a72aab4ae5a7126916ef3 Additional Hang Signature 6: e5e3 Additional Hang Signature 7: e5e3ca31dad607fa7b858ff5ea5c0fa9

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• Desktop appliciations are unable to launch my browser in Windows 8 [migrated]

  - by Alex Ford

  I have a fresh copy of Windows 8 Pro installed from MSDN. I have Google Chrome installed (stable channel) and it is set as my default browser. I even went into Control Panel Default Programs to ensure that Chrome had all its defaults. When other desktop applications try to launch my browser they always fail. For example, while trying to install the Android SDK for Windows the installer accurately detected that I did not have the JDK installed. It provides a friendly button to visit java.oracle.com. When pressing this button, nothing happens at all. You can see that here: http://youtu.be/XXL8GhuWWg0 If it were only that application that was having issues I wouldn't think anything of it but I have been encountering similar issues all over the place. Probably the most irritating one is when visual studio has updates; clicking the update button does nothing. http://www.youtube.com/watch?v=zwd1mn3TId0 You can see in that screencast that Visual Studio is not able to launch the browser no matter what I click. The update button doesn't do anything and neither do the two links in the update's description. Any suggestions? I'm assuming it's a Windows issue since it is happening in multiple applications.

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• One Windows Domain workstation can ping gateway but gets no internet access

  - by dindeman

  One of the (Windows XP SP3) workstations of our Windows Domain could not access internet anymore, this problem suddenly happened overnight. The domain controllers (there are three of them) are all running Windows Server 2008. First I compared the output of ipconfig /all on the faulty workstation with the output of a working workstation and it was just fine as it had always been. In particular the default gateway was correct and always remained pingable from the faulty workstation. I guessed that something was wrong with the DHCP service and I restarted the DHCP server service on all of our three DCs as well as the DHCP client service on the faulty workstation. This didn't solve the issue. I then thought of renewing the DHCP lease with ipconfig /release and ipconfig /renew and here is my first question: why did this never work? The same IP address (192.168.0.45) kept being assigned despite all my attempts to renew it (note that all our workstation are getting their TCP/IP automatically.) Even by leaving the domain and changing the computer name the same address was yet again obtained... Anyway I then proceeded to switch the TCP/IP configuration for that machine manually to another free valid IP address (192.168.0.41)... and then the internet access came back! I then cleared any traces of the previous IP in the DHCP leases list and in the DNS tables of our DCs and, after setting back the TCP/IP configuration to 'automatic', finally, the new lease would be granted (192.168.0.41) alongside with the internet access. My second question: what went suddenly wrong with the original IP address?

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• Windows 8 preinstall downgrade to Win 7: UEFI problems :/

  - by Tim Flemming

  I have a friend who has a Hp Laptop with UEFI booting. He locked himself out of windows 8 (forgot his password)... so he called me. Well after trying to use the latest version of chntpw in UBCD5.2.6, i came to the conclusion i needed to wipe the drive and install windows 7. A little googling suggested using certain versions of chntpw, but i decided to not waste the time burning endless CDs. Anyway, He agreed to installing Win7 "I hate the big tile thingys". So i attacked with Gparted. Wiped the whole drive. Set flags to boot. Set part table as MBR. However upon trying to install win7, it still claimed i had a GPT style disk. unable to install. the only thing i can think of I'm doing wrong is not changing the bios/UEFI to legacy... My question is, If I enable legacy, somehow get the drive to actually be MBR, and use my X86 DVD, should I be good? Is there some common glitches ppl miss when dealing with GPT/EFI/UEFI? I need answers cuz he now has a blank laptop which I am responsible for. Another question. windows 8 came installed on a GPT disk. SO WHY WHEN I BOOT THE INSTALL DVD DOES IT SAY IT CANT INSTALL TO A GPT STYLE DISK??? WTF??? talk about the bleeding edge man.

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• Repairing Windows 7 boot after Ubuntu 10.10 install

  - by Ted

  I've read various threads on this after googling, including one on this site. I had Windows 7 installed on an SSD. I wanted to try Ubuntu so I created a partition for it on the SSD and booted with the live CD to install Ubuntu. Went through the install and somehow Ubuntu carved out another partition on the SSD rather than using the one I had already created. Windows 7 would then not boot but Ubuntu would. I booted with my 7 cd and ran the automatic startup repair, it didn't find any problems. I then ran the bootsect command on the drive with 7. It said it repaired the bootmgr but Windows still would not boot and now Ubuntu won't either. I read somewhere else that it may be due to the partition that 7 was on being changed during the install. I don't care about the Ubuntu installation but I don't want to lose the 7 install, can I delete the ubuntu partition through booting with the 7 cd? Will that do any good? Thank you all! I'm stumped even though I've done startup repairs before, just not after Ubuntu install.

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• Grayed-Out Sleep and Hibernate Options on Windows 7 After Updating Graphics Driver

  - by Maxim Z.

  I have a Gateway M275 Tablet PC, on which I've installed Windows 7 Ultimate. The laptop is quite old, so there aren't any Win7 drivers for it, not to mention any Vista drivers. Win7 has been working for some time, but I noticed that my video output wasn't working. I went into Device Manager and found that I didn't have a driver for my video card: it just recognized it as the standard one. I searched online and found an XP driver for it, released by Gateway. Device Manager accepted this driver and prompted me to reboot. After that, I noticed that my Sleep and Hibernate options in the Shut Down menu have been grayed-out. I looked online and found that many people are attributing this to display drivers, as such an old driver would surely not be compatible with the standby procedures Windows 7 uses. To make it clear: I was able to Sleep and Hibernate before updating the drivers; now, I can't. Running powercfg /a gives me, "An internal system component has disabled this standby state," for each available standby mode. Is there some way that the driver can be modified to support hibernation? The new driver fixed my video output problem, but I guess hibernation is more important for me. If not, what steps should I take to remove the driver and just leave the standard Windows one, which previously supported hibernation and sleep on this computer? Thanks in advance.

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• Windows 7 using llt for ipv6

  - by Seoman

  The question asked below is based on the specific implementations of the Os not the RFC. Looking on a way to be able to assign a fixed ip address to a host, before it boots I found that Centos 6 works fine with no modifications and Windows 7 does not work at all. As defined in enter link description here exists 3 valid ways of generate a DUID: 1 Link-layer address plus time 2 Vendor-assigned unique ID based on Enterprise Number 3 Link-layer address Looking at the centos, that works fine, I can see the following autogenerated DUID: option dhcp6.client-id 0:1:0:1:19:60:25:f1:52:54:0:6b:b9:9e; and the MAC address for this host is: ifconfig eth1 | grep HWaddr eth1 Link encap:Ethernet HWaddr 52:54:00:6B:B9:9E As you can see, the DUID containts the MAC address. I can assign a fixed ip address to this host by including an entry on my dhcp server similar to: host vm { hardware ethernet 52:54:00:6B:B9:9E; fixed-address6 2001:db8:0:1::200; if packet(0,1) = 1 { log(debug,"VM Request match!"); } } And the Centos 6 gets his ip. On the windows side, I faced a common problem explained on this other link enter link description here As summary, Win7 uses the option 2 of the DUID generation or a variation of this one. On the link explains how to move it to a llt (link layer + time) but is not working fine. If I modify the DUID to one that looks like the one generated on Centos (but with the right MAC) it works as expected. Question 1 How Can I change the DUID generation for Windows 7 to be based on MAC as Centos 6 does? Thanks

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• Searching SharePoint site with Windows Explorer

  - by alexsome

  Every week, I manually backup recent versions of the files on my group's SharePoint site. I open the library in Windows Explorer, search for all files modified in the past week, then copy and paste them to a network location. We need this process because our SharePoint site has a quota that we would easily meet if we had unlimited versions, so we keep a history of older versions on the network. Recently I got an upgrade to my work computer and I am unable to search the site using Windows Explorer. When I run the search for files modified in the last week no results are returned. If I run a search with no criteria on the file library, all the files are found but the "modified on" field is blank. So the search results only have the file and type fields. The new computer has Windows XP, just like the old one did. I hope this makes sense. Does anyone have any clue what the problem could be? I'd be happy to provide more info if necessary. It's bugging me to no end and I'm not even sure where to begin looking - it's either a trivial issue or a very obscure one. Thanks a lot.

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• No "New Folder" button in windows 7

  - by user1125620

  My sibling's laptop is running windows 7 x64. The torrents folder in Documents doesn't show the New Folder button. ctrl+shift+n doesn't work either. I tried EVERYTHING here: Can't create new folder from anywhere in Windows 7 ..but nothing worked. As with the OP there, running the .reg file brings an error that says something about not being able to change the registry value while something is using it. I removed one entry at a time in the .reg file until I narrowed down the ones that were causing the problem, which were in HKEY_CLASSES_ROOT/CLSID. The only different reg value, however, was in HKEY_CLASSES_ROOT\CLSID{11dbb47c-a525-400b-9e80-a54615a090c0}\InProcServer32, for which the default value was %SystemRoot%\system32\explorerframe.dll and the value trying to be set ExplorerFrame.dll. I'm on windows 7 32bit and that's the same value I have for the entry, so I doubt that's it. The only thing I think is slightly off is that there is a user group with a strange name that only has execute and read access, and I can't grant it full control. Every time I try, it acts as if it works, but doesn't change it. I tried booting into safe mode and changing it, but it did the same thing. It is the folder where utorrent puts any new downloads, so it's possible utorrent did something, though that's never happened to me before. edit: I had renamed the folder to something else to avoid the problem, and then went onto my own computer to try to figure out what was wrong (I personally don't like using the touchpad on laptops). While searching, my sibling starting watching a movie. I minimized the movie and saw that the same thing had happened to the folder I renamed. Also changed was the file layout. It showed the different days and the files modified on those days. So, I was able to fix it by doing: Clicking Organize Layout Menu Bar On the menu bar clicking View Arrange By Folder

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• Am I "wasting" my time learning C and other low level stuff ?

  - by Andreas Grech

  I have just recently started learning C and the reason I did that was because frankly, I consider myself to be of a "less-developer" than the people who know and work with C. Thus I planned to start learning ASM, C, C++ and bought the K&R book and started pushing myself to learn the C Programming Language and up till now I'm doing great...learning about arrays the low level way (ie the pointer + offset thing), pointers and all that and obviously asking questions on stackoverflow for guidance. My problem is that sometimes I get thinking if instead of learning this low level stuff, maybe I should maybe spend more time learning newer, more widely used technologies...basically, more web stuff. Now I am well versed with both C# and ASP.Net and currently that's what I do for a living, but still there exists Microsoft technologies that I haven't quite touched upon...such as ASP.Net MVC, The Entity Framework etc... And those are only Microsoft Technologies...obviously there are other stuff that I would like to touch upon...stuff like Ruby, which would lead me to Ruby on Rails, or Python for Django or even Java and J2EE, or maybe even PHP; ie, basically mainly Web Stuff. Mind you, I did touch upon some of the stuff I mentioned earlier on, such as PHP and Java but I am still not quite versed in them as I am in C# and ASP.Net...but still, I think that by learning other languages that are used in the web environment will broaden my horizons...both as a developer who loves learning, and also Career wise. My point is, am I really using up my time correctly by learning older, lower level stuff? Stuff that for my current line of work, will most probably never use, but still is interesting to know ? To be frankly honest, I am also learning C so that I could, maybe someday, get into Electronics and Micro-controller programming but that is a whole new world for me and, if I choose to go there, will take some time to get adjusted to. And even then, I don't know if I can get a career in working in that line of work. ...but I still wonder about this question over and over...Am I doing the right thing by learning C instead of something (Web-stuff) that will most probably be more useful for me career-wise? I'm sorry for such asking such a long and most probably a boring question, but I feel as if this is the only place where I can ask such a question and get an honest answer from experts in the field. Thank you for your time.

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• How to check code is compatible with Windows 7

  - by Julen

  Hello, We are developing using Visual C# 2008 Express a program based on WPF under Windows XP machines (32 bits). The thing is that we have tried to run the program in two Windows 7 machines, one is 32 bits Windows 7 and the other is 64 bits Windows 7. Under Windows XP everything is fine. In Windows 7 machine, it launches in the 32 bits version altough there is an error when running one functionality (it does not happen in XP). In W7 64 bits it even does not launch. Is this normal? Is not possible to run 32 bit programs under W7 64-bits,even if they execute slower?? How can we check the code is compatible with Windows 7? Thank you very much in advance. Julen.

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• Help in decide the partition to install ubuntu

  - by G.Ashwin kumar

  I have a PC running with windows 7 ultimate 64 bit version with 4 gig Ram. I have a 320 gig hard disk , in which I have allocated 120 gig for windows 7, 100 gig for NY files(named ashwin in windows) and rest 80-90 gig partitioned but empty NTFS partition.Now where do I install Ubuntu so that windows and data is safe. I got the option install with windows I selected it , it then shows select drive(SCSI1 (0,0,0) (sda) -320.1 GB ATA WDC WD3200AAJS-6) and allocate driver by dragging the divider below which shows 66.5gb and 59.3 GB respectively. Which one do I go with? I clicked advance partitioning it shows five devices: device , type, m.point ,size.(mb), used(mb)......... /dev/sda1, NTFS, 104 , 35 (windows 7 loader) /dev/sda2, NTFS, 104752, 23604 /dev/sda3, NTFS, 125829, 10161 /dev/sda5, NTFS, 89382, 3221 when I checked size in properties it showed name of drive according to windows, used.Gb, free, total. ashwin, 10.2, 115.7, 125.8 c drive, 23.6, 81.1, 104.8 new volume, 92.6mb, 89.3, 89.4 except mentioned everything in gigabytes.ignore the last dots. I want to install it in new volume or using that space how do I do it? Explain in detail I'm a beginner.

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• Add Network Printer drivers in Windows 7/Server 2008 R2?

  - by Matias Nino

  I'm running a 64 bit Windows 7 / Windows 2008 R2 workstation that I just installed. I need to add a printer that is shared on the network from a 32bit Windows 2000 print server. This is an HP LaserJet 5Si printer, the drivers for which HP tells me are automatically built into Windows 7/R2. However, whenever I connect to the printer or try to add it, I get the following screen: Upon clicking OK, I get this screen asking me to locate the driver: How can I possibly locate a driver that is SUPPOSED TO BE NATIVELY SUPPORTED on Windows 7/R2? The tough part is that this printer is one of many shared on a server and does not have a direct IP address. Even worse: I have no access to the print server so I cannot put the 64 bit drivers on there. Any ideas? UPDATE: HP doesn't make a Vista driver either. It claims it is natively supported by Vista and 7, which is true because I am able to create a local printer on a fake tcp/ip port and Windows lets me pick the proper driver. However, when adding from the network, Windows does not let me select a driver and demands an INF. I tried searching the entire sub-structure of the C:\Windows directory and could not find any INF files that contain HP information. The INF might be located somewhere in the Windows installation DVD, but all the files on the DVD are compressed and unrecognizable. UPDATE #2 I installed the proper printer driver as a local printer (with no printer attached) and it installed. However, this did not change the fact that it STILL asks me to provide drivers when connecting to the networked printer.

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• Schliemann's method of programming language learning

  - by DVK

  Background: 19th-century German archeologist Heinrich Schliemann was of course famous for his successful quest to find and excavate the city of Troy (an actual archeological site for the Troy of Homer's Iliad). However, he is just as famous for being an astonishing learner of languages - within the space of two years, he taught himself fluent Dutch, English, French, Spanish, Italian and Portuguese, and later went on to learn seven more, including both modern and ancient Greek. One of the methods he famously used was comparison of a known text, e.g. take a book in a language one is fluent in, take a good translation of a book in a language you wish to learn, and go over them in parallel. (various sources cited the book used by Schliemann to be the Bible, or, as the link above states, a novel). Now, for the actual question. Has anyone used (or heard of) an equivalent of Schliemann's method for learning a new programming language? E.g. instead of basing the leaning on references and tutorials, take a somewhat comprehensive set of programs known to have high-quality code in both languages implementing similar/identical algorithms and learn by comparing them? I'm curious about either personal experiences of applying such an approach, or references to something published, or existance of codebases which could be used for such an approach? What got me thinking about the idea was Project Euler and some code snippets I saw on SO, in C++, Perl and Lisp.

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• Adapting Machine Learning Algorithms to my Problem

  - by Berkay

  i'm working on a project and need your ideas, advices. First of all, let me tell my problem. There is power button and some other keys of a machine and there is only one user has authentication to use this machine.There are no other authentication methods, the machine is in public area in a company. the machine is working with the combination of pressing power button and some other keys. The order of pressing keys is secret but we don't trust it, anybody can learn the password and can access the machine. i have the capability of managing the key hold time and also some other metrics to measure the time differences between the key such as horizantal or vertical key press times (differences). and also i can measure the hold time etc. These all means i have some inputs, Now i'm trying to get a user profile by analysing these inputs. My idea is to get the authenticated user to press the password n times and create a threshold or something similar to that. This method also can be said BIOMETRICS, anyone else who knows the machine button combination, can try the password but if he is out of this range can not get access it. How can i adapt these into my algorithms? where should i start ? i don't want to delve deep into machine learning, and also i can see the in my first try i can get false positive and false negative values really high, but i can manage it by changing my inputs. thanks.

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• Machine Learning Algorithm for Predicting Order of Events?

  - by user213060

  Simple machine learning question. Probably numerous ways to solve this: There is an infinite stream of 4 possible events: 'event_1', 'event_2', 'event_4', 'event_4' The events do not come in in completely random order. We will assume that there are some complex patterns to the order that most events come in, and the rest of the events are just random. We do not know the patterns ahead of time though. After each event is received, I want to predict what the next event will be based on the order that events have come in in the past. The predictor will then be told what the next event actually was: Predictor=new_predictor() prev_event=False while True: event=get_event() if prev_event is not False: Predictor.last_event_was(prev_event) predicted_event=Predictor.predict_next_event(event) The question arises of how long of a history that the predictor should maintain, since maintaining infinite history will not be possible. I'll leave this up to you to answer. The answer can't be infinte though for practicality. So I believe that the predictions will have to be done with some kind of rolling history. Adding a new event and expiring an old event should therefore be rather efficient, and not require rebuilding the entire predictor model, for example. Specific code, instead of research papers, would add for me immense value to your responses. Python or C libraries are nice, but anything will do. Thanks! Update: And what if more than one event can happen simultaneously on each round. Does that change the solution?

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• Learning Objective-C: Need advice on populating NSMutableDictionary

  - by Zigrivers

  I am teaching myself Objective-C utilizing a number of resources, one of which is the Stanford iPhone Dev class available via iTunes U (past 2010 class). One of the home work assignments asked that I populate a mutable dictionary with a predefined list of keys and values (URLs). I was able to put the code together, but as I look at it, I keep thinking there is probably a much better way for me to approach what I'm trying to do: Populate a NSMutableDictionary with the predefined keys and values Enumerate through the keys of the dictionary and check each key to see if it starts with "Stanford" If it meets the criteria, log both the key and the value I would really appreciate any feedback on how I might improve on what I've put together. I'm the very definition of a beginner, but I'm really enjoying the challenge of learning Objective-C. void bookmarkDictionary () { NSMutableDictionary* bookmarks = [NSMutableDictionary dictionary]; NSString* one = @"Stanford University", *two = @"Apple", *three = @"CS193P", *four = @"Stanford on iTunes U", *five = @"Stanford Mall"; NSString* urlOne = @"http://www.stanford.edu", *urlTwo = @"http://www.apple.com", *urlThree = @"http://cs193p.stanford.edu", *urlFour = @"http://itunes.stanford.edu", *urlFive = @"http://stanfordshop.com"; NSURL* oneURL = [NSURL URLWithString:urlOne]; NSURL* twoURL = [NSURL URLWithString:urlTwo]; NSURL* threeURL = [NSURL URLWithString:urlThree]; NSURL* fourURL = [NSURL URLWithString:urlFour]; NSURL* fiveURL = [NSURL URLWithString:urlFive]; [bookmarks setObject:oneURL forKey:one]; [bookmarks setObject:twoURL forKey:two]; [bookmarks setObject:threeURL forKey:three]; [bookmarks setObject:fourURL forKey:four]; [bookmarks setObject:fiveURL forKey:five]; NSString* akey; NSString* testString = @"Stanford"; for (akey in bookmarks) { if ([akey hasPrefix:testString]) { NSLog(@"Key: %@ URL: %@", akey, [bookmarks objectForKey:akey]); } } } Thanks for your help!

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• Advice on improving programming skills, learning capabilities?

  - by anonymous-coward1234

  Hi all, After 2,5 years of professional Java programing, I still have problems that make my job difficult and, more importantly - more times that I would like to admit - not enjoyable. I would like to ask for advice by more experienced people on ways that would help me overcome them. These are the problems I have: I do not absorb new knowledge easily. Even when I understand something, after a couple of days I easily forget even basic stuff. Other co-workers, even with the same working experience, when reading new technologies put things easily into "context", and are able to compare in "real time| similar technologies they already have used. I always try to address all the issues to whatever I am doing at one go, which results in me trying to resolve too many problems at the same time, losing completely control. I find it difficult to make my mind on a single problem that I should address first, and even when I do, and find myself throwing away code that I wrote because I started addressing the wrong issue first. As far as architecture and data modeling is concerned, I have difficulty making decisions on what objects must be created, with what hierarchy, interfaces, abstraction etc. I imagine that - to a certain degree - these things come with experience. But after 2,5 years of Java programming, I would expect myself to have come much farther that I have come, both in terms of absorption and experience. Is there a way to improve my learning speed? Any books, methods, advice is welcome.

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• Spaced repetition (SRS) for learning

  - by Fredrik Johansson

  A client has asked me to add a simple spaced repeition algorithm (SRS) for an onlinebased learning site. But before throwing my self into it, I'd like to discuss it with the community. Basically the site asks the user a bunch of questions (by automatically selecting say 10 out of 100 total questions from a database), and the user gives either a correct or incorrect answer. The users result are then stored in a database, for instance: userid questionid correctlyanswered dateanswered 1 123 0 (no) 2010-01-01 10:00 1 124 1 (yes) 2010-01-01 11:00 1 125 1 (yes) 2010-01-01 12:00 Now, to maximize a users ability to learn all answers, I should be able to apply an SRS algorithm so that a user, next time he takes the quiz, receives questions incorrectly answered more often; than questions answered correctly. Also, questions that are previously answered incorrectly, but recently often answered correctly should occur less often. Have anyone implemented something like this before? Any tips or suggestions? Theese are the best links I've found: http://en.wikipedia.org/wiki/Spaced_repetition http://www.mnemosyne-proj.org/principles.php http://www.supermemo.com/english/ol/sm2.htm

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• When to choose which machine learning classifier?

  - by LM

  Suppose I'm working on some classification problem. (Fraud detection and comment spam are two problems I'm working on right now, but I'm curious about any classification task in general.) How do I know which classifier I should use? (Decision tree, SVM, Bayesian, logistic regression, etc.) In which cases is one of them the "natural" first choice, and what are the principles for choosing that one? Examples of the type of answers I'm looking for (from Manning et al.'s "Introduction to Information Retrieval book": http://nlp.stanford.edu/IR-book/html/htmledition/choosing-what-kind-of-classifier-to-use-1.html): a. If your data is labeled, but you only have a limited amount, you should use a classifier with high bias (for example, Naive Bayes). [I'm guessing this is because a higher-bias classifier will have lower variance, which is good because of the small amount of data.] b. If you have a ton of data, then the classifier doesn't really matter so much, so you should probably just choose a classifier with good scalability. What are other guidelines? Even answers like "if you'll have to explain your model to some upper management person, then maybe you should use a decision tree, since the decision rules are fairly transparent" are good. I care less about implementation/library issues, though. Also, for a somewhat separate question, besides standard Bayesian classifiers, are there 'standard state-of-the-art' methods for comment spam detection (as opposed to email spam)? [Not sure if stackoverflow is the best place to ask this question, since it's more machine learning than actual programming -- if not, any suggestions for where else?]

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• Would anybody recommend learning J/K/APL?

  - by ozan

  I came across J/K/APL a few months ago while working my way through some project euler problems, and was intrigued, to say the least. For every elegant-looking 20 line python solution I produced, there'd be a gobsmacking 20 character J solution that ran in a tenth of the time. I've been keen to learn some basic J, and have made a few attempts at picking up the vocabulary, but have found the learning curve to be quite steep. To those who are familiar with these languages, would you recommend investing some time to learn one (I'm thinking J in particular)? I would do so more for the purpose of satisfying my curiosity than for career advancement or some such thing. Some personal circumstances to consider, if you care to: I love mathematics, and use it daily in my work (as a mathematician for a startup) but to be honest I don't really feel limited by the tools that I use (like python + NumPy) so I can't use that excuse. I have no particular desire to work in the finance industry, which seems to be the main port of call for K users at least. Plus I should really learn C# as a next language as it's the primary language where I work. So practically speaking, J almost definitely shouldn't be the next language I learn. I'm reasonably familiar with MATLAB so using an array-based programming language wouldn't constitute a tremendous paradigm shift. Any advice from those familiar with these languages would be much appreciated.

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• Learning libraries without books or tutorials

  - by Kawili-wili

  While many ask questions about where to find good books or tutorials, I'd like to take the opposite tack. I consider myself to be an entry-level programmer ready to move up to mid-level. I have written code in c, c++, c#, perl, python, clojure, vb, and java, so I'm not completely clueless. Where I see a problem in moving to the next level is learning to make better use of the literally hundreds upon hundreds of libraries available out there. I seem paralyzed unless there is a specific example in a book or tutorial to hand-hold me, yet I often read in various forums where another programmer attempts to assist with a question. He/she will look through the docs or scan the available classes/methods in their favorite IDE and seem to grok what's going on in a relatively short period of time, even if they had no previous experience with that specific library or function. I yearn to break the umbilical chord of constantly spending hour upon hour searching and reading, searching and reading, searching and reading. Many times there is no book or tutorial, or if there is, the discussion glosses over my specific needs or the examples shown are too far off the path for the usage I had in mind or the information is outdated and makes use of deprecated components or the library itself has fallen out of mainstream, yet is still perfectly usable (but no docs, books, or tutorials to hand-hold). My question is: In the absence of books or tutorials, what is the best way to grok new or unfamiliar libraries? I yearn to slicken the grok path so I can get down to the business of doing what I love most -- coding.

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• WPF or Silverlight Learning Resources for Business Applications

  - by Refracted Paladin

  I am the only developer at a non-profit organization(~200 employees) where we are a M$ shop and 90% of the things I develop are specific to our company and are internal only. I am given a lot of latitude on how I accomplish my goals so using new technologies is in my best interest. So far I have developed all winform & asp.net applications. I would now like to focus on XAML driven development(WPF & Silverlight) and would like your help. I am subscribed to numerous Silverlight blogs and I have went through a few good tutorials however, I would really appreciate a GOOD SOLID book in my hands going forward. I prefer learning books versus reference books and I REALLY would like one from a Business standpoint as well. Shameless, self-promoting is welcomed if you happen to be an author or reviewer for one that meets my criteria. I would, however, prefer that recomendations were based on first-hand experience(no, 'my friend as this awesome book he told me about', please). Though, I don't mind un-released books if say they are an updated version of an existing. disclaimer -- I know there are an insane amount of Book posts here(SO) but none I believe for my specific need. If there is and I missed it I apologize.

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